21174813601 has 2 divisors, whose sum is σ = 21174813602. Its totient is φ = 21174813600.

The previous prime is 21174813589. The next prime is 21174813677. The reversal of 21174813601 is 10631847112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20234778001 + 940035600 = 142249^2 + 30660^2 .

It is a cyclic number.

It is not a de Polignac number, because 21174813601 - 2⁹ = 21174813089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21174814601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10587406800 + 10587406801.

It is an arithmetic number, because the mean of its divisors is an integer number (10587406801).

Almost surely, 2^21174813601 is an apocalyptic number.

It is an amenable number.

21174813601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21174813601 is an equidigital number, since it uses as much as digits as its factorization.

21174813601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 21174813601 in words is "twenty-one billion, one hundred seventy-four million, eight hundred thirteen thousand, six hundred one".